工做小結，簡單的主頁框架，可左右滑動，viewpage+fragment，
一款安卓應用，好歹也是一個系統啊，既然稱得上是系統，就要考慮系統的穩定性，功能模塊的耦合性，複用程度等等，因此一個好的開發模型必然達到事半功倍的效果。java
目前（2015年11月），常見的手機應用基本上是登陸以後是一個主頁，首頁裏面嵌套着多個fragment或者view，fragment會採用緩存策略，點擊裏面的控件，例如按鈕，圖片，會彈出一個新的activity，負責給用戶提供特定的服務。最爲關鍵的是主頁，主頁顯示的內容一般是比較全面的，數據不少，例如微信的主頁，下面是4個tab(微信，通信錄，發現，我)，每點擊一個tab，tab上面內容都會切換到對應的Fragment或者view裏面。不管它們怎麼切換，都在同一個activity裏面，這個activity就是主activity，我習慣的命名是MainAcitivity。除了MainActivity，其餘新建的Activity，通常用戶要求是有統一標題欄風格，這個時候就要考慮寫一個activity的基類BaseActivity。而後全部的Activity都是這個基類的子類，若是後期須要修改風格（好比切換皮膚什麼的）只要修改基類就能夠了。android
BaseActivity基類，負責處理窗口切換的動畫效果，手勢，圖片資源回收等，是對activity的第一層封裝
緩存
package com.example.activitymode;
import java.util.ArrayList;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.RelativeLayout;
/**
* 基礎Activity
* 處理窗口切換動畫，手勢,回收圖片資源等
*
*/
public class BaseActivity extends FragmentActivity {
final int RIGHT = 0;
final int LEFT = 1;
protected GestureDetector gestureDetector;
protected RelativeLayout mChildContent;
/**
* 是否執行界面切換動畫
*/
protected boolean isAnimation = true;
private Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext = this;
requestWindowFeature(Window.FEATURE_NO_TITLE);
// 設置切換窗口的模式
getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
gestureDetector = new GestureDetector(this, onGestureListener);
}
@Override
public void setContentView(int layoutResID) {
// TODO Auto-generated method stub
super.setContentView(R.layout.base_layout);
mChildContent = (RelativeLayout) findViewById(R.id.main_content);
View childView = LayoutInflater.from(this).inflate(layoutResID,
mChildContent);
}
/**
* 開啓窗口的動畫模式，左右切換
*/
@Override
public void startActivity(Intent intent) {
// TODO Auto-generated method stub
super.startActivity(intent);
if (isAnimation) {
overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out);
}
}
/**
* 跳轉到新窗口時，根據結果實現回退
*/
@Override
public void startActivityForResult(Intent intent, int requestCode) {
// TODO Auto-generated method stub
super.startActivityForResult(intent, requestCode);
if (isAnimation) {
overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out);
}
}
@Override
public void finish() {
// TODO Auto-generated method stub
super.finish();
if (isAnimation) {
overridePendingTransition(R.anim.push_right_in,
R.anim.push_right_out);
}
}
private GestureDetector.OnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
if (e2 == null || e1 == null) {
return false;
}
if (e2.getX() - e1.getX() > 20 && Math.abs(velocityX) > 0) {
} else if (e1.getX() - e2.getX() > 20 && Math.abs(velocityX) > 0) {
} else
return false;
return true;
}
};
public boolean onTouchEvent(MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
/** 頂部功能菜單被點擊，子類實現此方法處理點擊的具體操做 */
public void topOpermenuClicked() {
}
@Override
protected void onPause() {
super.onPause();
if (baseReceiver != null)
unregisterReceiver(baseReceiver);
}
// 動態註冊的廣播接收器，當有接收到廣播的時候，能夠根據廣播的action進行相應的操做
// 子類也能夠綁定本身的動態廣播接收器
protected BaseReceiver baseReceiver;
@Override
protected void onResume() {
super.onResume();
if (baseReceiver == null)
baseReceiver = new BaseReceiver();
IntentFilter filter = new IntentFilter(baseReceiver.ACTION);
registerReceiver(baseReceiver, filter);
}
// Activity銷燬
@Override
protected void onDestroy() {
super.onDestroy();
}
/**
* 回收View
*
* @param v
*/
public void destroyLevelListView(View v) {
if (v == null)
return;
Drawable lld = v.getBackground();
if (lld == null)
return;
lld.setCallback(null);
lld = null;
v = null;
}
/**
* 回收圖片
*
* @param v
* @param recycle
*/
public void destroyBackground(View v, boolean recycle) {
if (v == null)
return;
BitmapDrawable bd = (BitmapDrawable) v.getBackground();
if (bd == null)
return;
bd.setCallback(null);
if (recycle)
bd.getBitmap().recycle();
bd = null;
v = null;
}
/**
* 回收圖片
*
* @param v
* @param recycle
*/
public void destroyDrawable(BitmapDrawable bd, boolean recycle) {
if (bd == null)
return;
bd.setCallback(null);
if (recycle)
bd.getBitmap().recycle();
bd = null;
}
/**
* 回收圖片
*
* @param v
* @param recycle
*/
public void destroyDrawable(Drawable bd) {
if (bd == null)
return;
bd.setCallback(null);
bd = null;
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
public void destroyViews(View views[]) {
if (views == null || views.length == 0)
return;
for (View view : views) {
destroyViews(view, false);
}
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
public void destroyViews(View rootView, boolean recycle) {
if (rootView == null)
return;
ArrayList<View> views = rootView.getTouchables();
if (views != null && !views.isEmpty()) {
for (View view : views)
destroyView(view, recycle);
}
destroyView(rootView, recycle);
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
public void destroyViews(View rootView) {
if (rootView == null)
return;
ArrayList<View> views = rootView.getTouchables();
if (views != null && !views.isEmpty()) {
for (View view : views)
destroyView(view);
}
destroyView(rootView);
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
public void destroyView(View view) {
if (view == null)
return;
Drawable bd = view.getBackground();
destroyDrawable(bd);
view = null;
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
public void destroyView(View view, boolean recycle) {
if (view == null)
return;
Drawable bd = view.getBackground();
if (recycle)
destroyBackground(bd);
else
destroyDrawable(bd);
view = null;
}
/**
* 回收界面控件
*
* @param v
* @param recycle
*/
private void destroyBackground(Drawable bd) {
if (bd == null) {
return;
}
if (bd instanceof BitmapDrawable)
destroyDrawable((BitmapDrawable) bd, true);
else
destroyDrawable(bd);
bd = null;
}
}
BaseActivity的佈局文件微信
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <RelativeLayout android:id="@+id/main_content" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" > </RelativeLayout> </LinearLayout>
通用窗口類CommoneActivity，繼承於BaseActivity，集中處理統一的標題欄，非首頁的Acititvy都應該繼承它，app
如本例中的MoreActivity
異步
package com.example.activitymode;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
/**
* 集中處理標題
* @author cgx
*
*/
public class CommonActivity extends BaseActivity {
protected LinearLayout llhead, llBack, llMenu;
protected RelativeLayout rlcontent, rlRoot;
protected TextView tvback, tvtitle, tvmenu;
/**
* 是否覆蓋頭部,默認不覆蓋
*/
protected boolean isOverridehead = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
public void setContentView(int layoutResID, boolean isOverridehead) {
this.isOverridehead = isOverridehead;
this.setContentView(layoutResID);
}
@Override
public void setContentView(int layoutResID) {
// TODO Auto-generated method stub
super.setContentView(R.layout.common_activity_base_layout);
rlRoot = (RelativeLayout) findViewById(R.id.child_main);
llhead = (LinearLayout) findViewById(R.id.child_head);
rlcontent = (RelativeLayout) findViewById(R.id.chid_content);
tvback = (TextView) findViewById(R.id.child_back_text);
llBack = (LinearLayout) findViewById(R.id.child_back_layout);
tvtitle = (TextView) findViewById(R.id.child_title_text);
tvmenu = (TextView) findViewById(R.id.child_menu_text);
llMenu = (LinearLayout) findViewById(R.id.child_menu_layout);
if (!isOverridehead) {
View chidview = LayoutInflater.from(this).inflate(layoutResID,
rlcontent);
} else {
View chidview = LayoutInflater.from(this)
.inflate(layoutResID, null);
rlRoot.addView(chidview, 0);
llhead.setBackgroundResource(Color.parseColor("#00000000"));
}
llBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
setMenuVisibility(View.INVISIBLE);
}
public void setHeadVisibility(int visible) {
llhead.setVisibility(visible);
}
public void setTitle(String title) {
tvtitle.setText(title);
}
public void setMenuVisibility(int visible) {
llMenu.setVisibility(visible);
}
@Override
public void setTitle(CharSequence title) {
// TODO Auto-generated method stub
setTitle(title.toString());
}
public void setMenuText(String text) {
this.tvmenu.setText(text);
}
public void setMenuBK(int id) {
this.tvmenu.setBackgroundResource(id);
}
public void setOnMenuClickListen(OnClickListener onclicklistener) {
this.llMenu.setOnClickListener(onclicklistener);
}
@Override
public void setTitle(int titleId) {
// TODO Auto-generated method stub
setTitle(getText(titleId).toString());
}
}
通用窗口類CommonActivity的佈局文件，新建窗口須要繼承於它ide
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/child_main" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#FFFFFF" android:orientation="vertical" > <LinearLayout android:id="@+id/child_head" android:layout_width="match_parent" android:layout_height="50dp" android:background="#654321" android:orientation="horizontal" > <LinearLayout android:id="@+id/child_back_layout" android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" android:paddingLeft="12dp" android:paddingRight="12dp" > <TextView android:id="@+id/child_back_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/comeback" android:gravity="center" android:text="" android:textColor="#ffffff" android:textSize="14dp" /> </LinearLayout> <TextView android:id="@+id/child_title_text" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="標題" android:textColor="#ffffff" android:textSize="17dp" /> <LinearLayout android:id="@+id/child_menu_layout" android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" android:paddingLeft="12dp" android:paddingRight="12dp" > <TextView android:id="@+id/child_menu_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/main_more_icon" android:gravity="center" android:text="" android:textColor="#ffffff" android:textSize="14dp" /> </LinearLayout> </LinearLayout> <RelativeLayout android:id="@+id/chid_content" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/child_head" /> </RelativeLayout>
首頁MainActivity，內嵌了四個fragment，MainActivity直接繼承於BaseActivity，制定屬於首頁的標題欄（導航欄）佈局
package com.example.activitymode;
import java.util.ArrayList;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends BaseActivity {
private static final String TAG = "MainActivity";
private ViewPager vpContent;
private MainFragmentAdapter mFragmentAdapter;
private CommonFragmentSaveStatePagerAdapter myFragmentSaveStatePagerAdapter;
private ArrayList<CommonFragment> mFragments;
private ArrayList<String> mTitles;
Context mContext;
TextView tv1, tv2, tv3, tv4, tvmenu;
LinearLayout llMenu;
MyFragment1 mFragment1;
MyFragment2 mFragment2;
MyFragment3 mFragment3;
MyFragment4 mFragment4;
// ImageView ivCursor;
/**
* 主頁四個page 「第一個」page
*/
public static final int FIRST_PAGE = 0;
/**
* 「第二個」page
*/
public static final int SECOND_PAGE = 1;
/**
* 「第三個」page
*/
public static final int THIRD_PAGE = 2;
/**
* "第四個"page
*/
public static final int FOURTH_PAGE = 3;
private boolean isRegisterBroadcast = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
mContext = this;
setContentView(R.layout.main_layout);
initView();
initPageView();
initEvent();
initApp();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
private void initView() {
vpContent = (ViewPager) findViewById(R.id.v50_main_viewpager);
tv1 = (TextView) findViewById(R.id.main_text1);
tv1.setTextColor(Color.parseColor("#FFFF00"));
tv2 = (TextView) findViewById(R.id.main_text2);
tv3 = (TextView) findViewById(R.id.main_text3);
tv4 = (TextView) findViewById(R.id.main_text4);
tvmenu = (TextView) findViewById(R.id.main_menu_text);
llMenu = (LinearLayout) findViewById(R.id.main_menu_layout);
}
private void initEvent() {
// TODO Auto-generated method stub
tv1.setOnClickListener(mClickListener);
tv2.setOnClickListener(mClickListener);
tv3.setOnClickListener(mClickListener);
tv4.setOnClickListener(mClickListener);
llMenu.setOnClickListener(mClickListener);
vpContent.setOnPageChangeListener(mPageChangeListener);
}
private OnClickListener mClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.main_text1:// 第一個page
setCurPage(FIRST_PAGE);
break;
case R.id.main_text2:// 第二個page
setCurPage(SECOND_PAGE);
break;
case R.id.main_text3:// 第三個page
setCurPage(THIRD_PAGE);
break;
case R.id.main_text4:// 第四個page
setCurPage(FOURTH_PAGE);
break;
case R.id.main_menu_layout:// 菜單
IntentToMoreActivity();
break;
default:
break;
}
}
};
public void setCurPage(int page) {
vpContent.setCurrentItem(page, false);
}
private OnPageChangeListener mPageChangeListener = new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
chosenTab(arg0);
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
};
private void chosenTab(int currentItem) {
tv1.setTextColor(Color.parseColor("#FFFFFF"));
tv2.setTextColor(Color.parseColor("#FFFFFF"));
tv3.setTextColor(Color.parseColor("#FFFFFF"));
tv4.setTextColor(Color.parseColor("#FFFFFF"));
switch (currentItem) {
case FIRST_PAGE:
tv1.setTextColor(Color.parseColor("#FFFF00"));
break;
case SECOND_PAGE:
tv2.setTextColor(Color.parseColor("#FFFF00"));
break;
case THIRD_PAGE:
tv3.setTextColor(Color.parseColor("#FFFF00"));
break;
case FOURTH_PAGE:
tv4.setTextColor(Color.parseColor("#FFFF00"));
break;
default:
break;
}
}
private void initPageView() {
// TODO Auto-generated method stub
mFragment1 = new MyFragment1();
mFragment2 = new MyFragment2();
mFragment3 = new MyFragment3();
mFragment4 = new MyFragment4();
mFragments = new ArrayList<CommonFragment>();
mFragments.add(mFragment1);
mFragments.add(mFragment2);
mFragments.add(mFragment3);
mFragments.add(mFragment4);
mTitles = new ArrayList<String>();
mTitles.add(mFragment1.getTitle());
mTitles.add(mFragment2.getTitle());
mTitles.add(mFragment3.getTitle());
mTitles.add(mFragment4.getTitle());
mFragmentAdapter = new MainFragmentAdapter(getSupportFragmentManager(),
mFragments, mTitles);
myFragmentSaveStatePagerAdapter = new CommonFragmentSaveStatePagerAdapter(
getSupportFragmentManager(), vpContent, mFragments);
vpContent.setAdapter(myFragmentSaveStatePagerAdapter);
// 設置默認的窗口，就是打開應用後第一眼看到的
setCurPage(FIRST_PAGE);
// 若是系統內存足夠，就能實現fragment的緩存，參數是最大緩存數,若是數據量太大，就不要這樣設置，耗內存
// vpContent.setOffscreenPageLimit(5);
}
/** 開啓系統設置頁面 **/
protected void IntentToMoreActivity() {
// TODO Auto-generated method stub
Intent intent = new Intent(MainActivity.this, MoreActivity.class);
startActivity(intent);
}
/**
* 初始化app
*/
private void initApp() {
}
/** 註冊配置請求完成廣播 */
public void registerBoradcastReceiver() {
IntentFilter myIntentFilter = new IntentFilter();
myIntentFilter.addAction("main_action");
// 註冊廣播
this.registerReceiver(mBroadcastReceiver, myIntentFilter);
isRegisterBroadcast = true;
}
/** 取消註冊的廣播 */
public void unRegisterBoradcastReceiver() {
if (isRegisterBroadcast) {
this.unregisterReceiver(mBroadcastReceiver);
}
}
/** 廣播接收器 */
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
// 執行接受到廣播後的相關操做，能夠操做UI，但不能進行耗時操做
}
};
/**
* 跳轉到對應的activity
*
* @param c
*/
public void intentToActivity(Class c) {
if (c == null) {
return;
}
Intent intent = new Intent(this, c);
startActivity(intent);
}
public void intentToActivityForResult(int requestCode, Class c) {
if (c == null) {
return;
}
Intent intent = new Intent(mContext, c);
((Activity) mContext).startActivityForResult(intent, requestCode);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
// 若是有提示退出對話框，能夠在這裏寫代碼
finish();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
/**
* 隱藏應用，返回到桌面
*/
public void hide() {
// 保存設置信息
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
首頁的佈局
動畫
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:id="@+id/main_head" android:layout_width="match_parent" android:layout_height="50dp" android:background="#654321" android:orientation="horizontal" android:paddingLeft="12dp" android:paddingRight="12dp" > <TextView android:id="@+id/main_text1" android:layout_width="50dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="page1" android:textColor="#b3ffffff" android:textSize="15dp" /> <TextView android:id="@+id/main_text2" android:layout_width="50dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="page2" android:textColor="#b3ffffff" android:textSize="15dp" /> <TextView android:id="@+id/main_text3" android:layout_width="50dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="page3" android:textColor="#b3ffffff" android:textSize="15dp" /> <TextView android:id="@+id/main_text4" android:layout_width="50dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="page4" android:textColor="#b3ffffff" android:textSize="15dp" /> <LinearLayout android:id="@+id/main_menu_layout" android:layout_width="50dp" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/main_menu_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/main_more_icon" android:gravity="center" android:textColor="#ffffff" /> </LinearLayout> </LinearLayout> <android.support.v4.view.ViewPager android:id="@+id/v50_main_viewpager" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/main_head" /> </RelativeLayout>
關於fragment，實現了滑動切換的效果，須要對Fragment進行封裝，封裝後的類名是CommonFragment，添加滑動效果this
package com.example.activitymode;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
public class CommonFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void startActivity(Intent intent) {
super.startActivity(intent);
getActivity().overridePendingTransition(R.anim.push_left_in,
R.anim.push_left_out);
}
@Override
public void startActivityForResult(Intent intent, int requestCode) {
super.startActivityForResult(intent, requestCode);
getActivity().overridePendingTransition(R.anim.push_left_in,
R.anim.push_left_out);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Auto-generated method stub
}
@Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
public void onBackPressed() {
}
public void onTabChange() {
}
}
首頁裏面的一個Fragment，因爲其餘3個都是相似的，因此只提供一個代碼
package com.example.activitymode;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MyFragment1 extends CommonFragment {
public static String title = "MyFragment1";
private View rootView;
public String getTitle() {
// TODO Auto-generated method stub
return title;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
rootView = inflater
.inflate(R.layout.fragment1_layout, container, false);
return rootView;
}
}
佈局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#123456" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:textColor="#ffffff" android:text="The first page" /> </LinearLayout>
適配器：
CommonFragmentPagerAdapter
viewpager的fragment適配器，fragment管理類FragmentManager,不顯示的fragment採起銷燬策略
緩存策略爲顯示頁面左邊第一個以及右邊第一個
package com.example.activitymode;
import java.util.ArrayList;
import java.util.List;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
/**
* viewpager的fragment適配器，fragment管理類FragmentManager，自帶緩存策略的適配器，
* 緩存策略爲顯示頁面左邊第一個以及右邊第一個
*
*
*/
public abstract class CommonFragmentPagerAdapter extends PagerAdapter {
private static final String TAG = "CommonFragmentPagerAdapter";
private final FragmentManager mFragmentManager;
private FragmentTransaction mCurTransaction = null;
private Fragment mCurrentPrimaryItem = null;
private List<Fragment> mFragments;
public CommonFragmentPagerAdapter(FragmentManager fm) {
mFragmentManager = fm;
}
public CommonFragmentPagerAdapter(FragmentManager fm,
ArrayList<Fragment> fragments) {
mFragmentManager = fm;
this.mFragments = fragments;
}
public abstract Fragment getItem(int position);
@Override
public int getCount() {
return mFragments.size();
}
@Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
@Override
public void startUpdate(View container) {
}
@Override
public Object instantiateItem(View container, int position) {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction();
}
final long itemId = getItemId(position);
String name = makeFragmentName(container.getId(), itemId);
Fragment fragment = mFragmentManager.findFragmentByTag(name);
if (fragment != null) {
// mCurTransaction.detach(fragment);
mCurTransaction.attach(fragment);
} else {
fragment = getItem(position);
mCurTransaction.add(container.getId(), fragment,
makeFragmentName(container.getId(), itemId));
}
if (fragment != mCurrentPrimaryItem) {
fragment.setMenuVisibility(false);
fragment.setUserVisibleHint(false);
}
return fragment;
}
@Override
public void destroyItem(View container, int position, Object object) {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction();
}
mCurTransaction.detach((Fragment) object);
}
@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
Fragment fragment = (Fragment) object;
if (fragment != mCurrentPrimaryItem) {
if (mCurrentPrimaryItem != null) {
mCurrentPrimaryItem.setMenuVisibility(false);
mCurrentPrimaryItem.setUserVisibleHint(false);
}
if (fragment != null) {
fragment.setMenuVisibility(true);
fragment.setUserVisibleHint(true);
}
mCurrentPrimaryItem = fragment;
}
super.setPrimaryItem(container, position, object);
}
@Override
public void finishUpdate(View container) {
if (mCurTransaction != null) {
mCurTransaction.commitAllowingStateLoss();
mCurTransaction = null;
mFragmentManager.executePendingTransactions();
}
}
@Override
public boolean isViewFromObject(View view, Object object) {
return ((Fragment) object).getView() == view;
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
return position;
}
private static String makeFragmentName(int viewId, long id) {
return "android:switcher:" + viewId + ":" + id;
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
// if (mCurTransaction == null) {
// mCurTransaction = mFragmentManager.beginTransaction();
// }
// final long itemId = getItemId(position);
// String name = makeFragmentName(container.getId(), itemId);
// Fragment fragment = mFragmentManager.findFragmentByTag(name);
// if (fragment != null) {
// mCurTransaction.detach(fragment);
// mCurTransaction.attach(fragment);
// }
super.notifyDataSetChanged();
}
}
package com.example.activitymode;
import java.util.List;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
public class CommonFragmentSaveStatePagerAdapter extends PagerAdapter {
private List<CommonFragment> fragments;
private FragmentManager fragmentManager;
private ViewPager viewPager;
private int currentPageIndex = 0;
private OnExtraPageChangeListener onExtraPageChangeListener;
public CommonFragmentSaveStatePagerAdapter(FragmentManager fragmentManager,
ViewPager viewPager, List<CommonFragment> fragments) {
this.fragments = fragments;
this.fragmentManager = fragmentManager;
this.viewPager = viewPager;
this.viewPager.setAdapter(this);
this.viewPager.setOnPageChangeListener(mOnPageChangeListener);
}
@Override
public int getCount() {
return fragments.size();
}
@Override
public boolean isViewFromObject(View view, Object o) {
return view == o;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(fragments.get(position).getView()); // 移出viewpager兩邊以外的page佈局
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = fragments.get(position);
if (!fragment.isAdded()) {
FragmentTransaction ft = fragmentManager.beginTransaction();
ft.add(fragment, fragment.getClass().getSimpleName());
ft.commit();
/**
* 在用FragmentTransaction.commit()方法提交FragmentTransaction對象後
* 會在進程的主線程中，用異步的方式來執行。 若是想要當即執行這個等待中的操做，就要調用這個方法（只能在主線程中調用）。
* 要注意的是，全部的回調和相關的行爲都會在這個調用中被執行完成，所以要仔細確認這個方法的調用位置。
*/
fragmentManager.executePendingTransactions();
}
if (fragment.getView().getParent() == null) {
container.addView(fragment.getView());
}
return fragment.getView();
}
public int getCurrentPageIndex() {
return currentPageIndex;
}
public OnExtraPageChangeListener getOnExtraPageChangeListener() {
return onExtraPageChangeListener;
}
public void setOnExtraPageChangeListener(
OnExtraPageChangeListener onExtraPageChangeListener) {
this.onExtraPageChangeListener = onExtraPageChangeListener;
}
private OnPageChangeListener mOnPageChangeListener = new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
fragments.get(currentPageIndex).onPause();
if (fragments.get(arg0).isAdded()) {
fragments.get(arg0).onResume();
}
currentPageIndex = arg0;
if (null != onExtraPageChangeListener) {
onExtraPageChangeListener.onExtraPageSelected(arg0);
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
if (null != onExtraPageChangeListener) {
onExtraPageChangeListener.onExtraPageScrolled(arg0, arg1, arg2);
}
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
if (null != onExtraPageChangeListener) {
onExtraPageChangeListener.onExtraPageScrollStateChanged(arg0);
}
}
};
static class OnExtraPageChangeListener {
public void onExtraPageScrolled(int i, float v, int i2) {
}
public void onExtraPageSelected(int i) {
}
public void onExtraPageScrollStateChanged(int i) {
}
}
}
其餘非首頁的Activity，這裏的試例是MoreActivity
package com.example.activitymode;
import android.os.Bundle;
public class MoreActivity extends CommonActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.more_activity_layout);
setTitle("菜單");
}
}
佈局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="Menu activity" android:gravity="center" android:background="#ffffff"/> </LinearLayout>
demo項目代碼
http://pan.baidu.com/s/1i3o9bVJ
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